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TDLS: Use existing peer entry if available when processing discovery
[thirdparty/hostap.git] / src / rsn_supp / tdls.c
1 /*
2 * wpa_supplicant - TDLS
3 * Copyright (c) 2010-2011, Atheros Communications
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/os.h"
14 #include "common/ieee802_11_defs.h"
15 #include "crypto/sha256.h"
16 #include "crypto/crypto.h"
17 #include "crypto/aes_wrap.h"
18 #include "rsn_supp/wpa.h"
19 #include "rsn_supp/wpa_ie.h"
20 #include "rsn_supp/wpa_i.h"
21 #include "drivers/driver.h"
22 #include "l2_packet/l2_packet.h"
23
24 #ifdef CONFIG_TDLS_TESTING
25 #define TDLS_TESTING_LONG_FRAME BIT(0)
26 #define TDLS_TESTING_ALT_RSN_IE BIT(1)
27 #define TDLS_TESTING_DIFF_BSSID BIT(2)
28 #define TDLS_TESTING_SHORT_LIFETIME BIT(3)
29 #define TDLS_TESTING_WRONG_LIFETIME_RESP BIT(4)
30 #define TDLS_TESTING_WRONG_LIFETIME_CONF BIT(5)
31 #define TDLS_TESTING_LONG_LIFETIME BIT(6)
32 #define TDLS_TESTING_CONCURRENT_INIT BIT(7)
33 #define TDLS_TESTING_NO_TPK_EXPIRATION BIT(8)
34 #define TDLS_TESTING_DECLINE_RESP BIT(9)
35 #define TDLS_TESTING_IGNORE_AP_PROHIBIT BIT(10)
36 unsigned int tdls_testing = 0;
37 #endif /* CONFIG_TDLS_TESTING */
38
39 #define TPK_LIFETIME 43200 /* 12 hours */
40 #define TPK_RETRY_COUNT 3
41 #define TPK_TIMEOUT 5000 /* in milliseconds */
42
43 #define TDLS_MIC_LEN 16
44
45 #define TDLS_TIMEOUT_LEN 4
46
47 struct wpa_tdls_ftie {
48 u8 ie_type; /* FTIE */
49 u8 ie_len;
50 u8 mic_ctrl[2];
51 u8 mic[TDLS_MIC_LEN];
52 u8 Anonce[WPA_NONCE_LEN]; /* Responder Nonce in TDLS */
53 u8 Snonce[WPA_NONCE_LEN]; /* Initiator Nonce in TDLS */
54 /* followed by optional elements */
55 } STRUCT_PACKED;
56
57 struct wpa_tdls_timeoutie {
58 u8 ie_type; /* Timeout IE */
59 u8 ie_len;
60 u8 interval_type;
61 u8 value[TDLS_TIMEOUT_LEN];
62 } STRUCT_PACKED;
63
64 struct wpa_tdls_lnkid {
65 u8 ie_type; /* Link Identifier IE */
66 u8 ie_len;
67 u8 bssid[ETH_ALEN];
68 u8 init_sta[ETH_ALEN];
69 u8 resp_sta[ETH_ALEN];
70 } STRUCT_PACKED;
71
72 /* TDLS frame headers as per IEEE Std 802.11z-2010 */
73 struct wpa_tdls_frame {
74 u8 payloadtype; /* IEEE80211_TDLS_RFTYPE */
75 u8 category; /* Category */
76 u8 action; /* Action (enum tdls_frame_type) */
77 } STRUCT_PACKED;
78
79 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs);
80 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx);
81 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer);
82
83
84 #define TDLS_MAX_IE_LEN 80
85 #define IEEE80211_MAX_SUPP_RATES 32
86
87 struct wpa_tdls_peer {
88 struct wpa_tdls_peer *next;
89 int initiator; /* whether this end was initiator for TDLS setup */
90 u8 addr[ETH_ALEN]; /* other end MAC address */
91 u8 inonce[WPA_NONCE_LEN]; /* Initiator Nonce */
92 u8 rnonce[WPA_NONCE_LEN]; /* Responder Nonce */
93 u8 rsnie_i[TDLS_MAX_IE_LEN]; /* Initiator RSN IE */
94 size_t rsnie_i_len;
95 u8 rsnie_p[TDLS_MAX_IE_LEN]; /* Peer RSN IE */
96 size_t rsnie_p_len;
97 u32 lifetime;
98 int cipher; /* Selected cipher (WPA_CIPHER_*) */
99 u8 dtoken;
100
101 struct tpk {
102 u8 kck[16]; /* TPK-KCK */
103 u8 tk[16]; /* TPK-TK; assuming only CCMP will be used */
104 } tpk;
105 int tpk_set;
106 int tpk_success;
107
108 struct tpk_timer {
109 u8 dest[ETH_ALEN];
110 int count; /* Retry Count */
111 int timer; /* Timeout in milliseconds */
112 u8 action_code; /* TDLS frame type */
113 u8 dialog_token;
114 u16 status_code;
115 int buf_len; /* length of TPK message for retransmission */
116 u8 *buf; /* buffer for TPK message */
117 } sm_tmr;
118
119 u16 capability;
120
121 u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
122 size_t supp_rates_len;
123 };
124
125
126 static int wpa_tdls_get_privacy(struct wpa_sm *sm)
127 {
128 /*
129 * Get info needed from supplicant to check if the current BSS supports
130 * security. Other than OPEN mode, rest are considered secured
131 * WEP/WPA/WPA2 hence TDLS frames are processed for TPK handshake.
132 */
133 return sm->pairwise_cipher != WPA_CIPHER_NONE;
134 }
135
136
137 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
138 {
139 os_memcpy(pos, ie, ie_len);
140 return pos + ie_len;
141 }
142
143
144 static int wpa_tdls_del_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
145 {
146 if (wpa_sm_set_key(sm, WPA_ALG_NONE, peer->addr,
147 0, 0, NULL, 0, NULL, 0) < 0) {
148 wpa_printf(MSG_WARNING, "TDLS: Failed to delete TPK-TK from "
149 "the driver");
150 return -1;
151 }
152
153 return 0;
154 }
155
156
157 static int wpa_tdls_set_key(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
158 {
159 u8 key_len;
160 u8 rsc[6];
161 enum wpa_alg alg;
162
163 os_memset(rsc, 0, 6);
164
165 switch (peer->cipher) {
166 case WPA_CIPHER_CCMP:
167 alg = WPA_ALG_CCMP;
168 key_len = 16;
169 break;
170 case WPA_CIPHER_NONE:
171 wpa_printf(MSG_DEBUG, "TDLS: Pairwise Cipher Suite: "
172 "NONE - do not use pairwise keys");
173 return -1;
174 default:
175 wpa_printf(MSG_WARNING, "TDLS: Unsupported pairwise cipher %d",
176 sm->pairwise_cipher);
177 return -1;
178 }
179
180 if (wpa_sm_set_key(sm, alg, peer->addr, -1, 1,
181 rsc, sizeof(rsc), peer->tpk.tk, key_len) < 0) {
182 wpa_printf(MSG_WARNING, "TDLS: Failed to set TPK to the "
183 "driver");
184 return -1;
185 }
186 return 0;
187 }
188
189
190 static int wpa_tdls_send_tpk_msg(struct wpa_sm *sm, const u8 *dst,
191 u8 action_code, u8 dialog_token,
192 u16 status_code, const u8 *buf, size_t len)
193 {
194 return wpa_sm_send_tdls_mgmt(sm, dst, action_code, dialog_token,
195 status_code, buf, len);
196 }
197
198
199 static int wpa_tdls_tpk_send(struct wpa_sm *sm, const u8 *dest, u8 action_code,
200 u8 dialog_token, u16 status_code,
201 const u8 *msg, size_t msg_len)
202 {
203 struct wpa_tdls_peer *peer;
204
205 wpa_printf(MSG_DEBUG, "TDLS: TPK send dest=" MACSTR " action_code=%u "
206 "dialog_token=%u status_code=%u msg_len=%u",
207 MAC2STR(dest), action_code, dialog_token, status_code,
208 (unsigned int) msg_len);
209
210 if (wpa_tdls_send_tpk_msg(sm, dest, action_code, dialog_token,
211 status_code, msg, msg_len)) {
212 wpa_printf(MSG_INFO, "TDLS: Failed to send message "
213 "(action_code=%u)", action_code);
214 return -1;
215 }
216
217 if (action_code == WLAN_TDLS_SETUP_CONFIRM ||
218 action_code == WLAN_TDLS_TEARDOWN ||
219 action_code == WLAN_TDLS_DISCOVERY_REQUEST ||
220 action_code == WLAN_TDLS_DISCOVERY_RESPONSE)
221 return 0; /* No retries */
222
223 for (peer = sm->tdls; peer; peer = peer->next) {
224 if (os_memcmp(peer->addr, dest, ETH_ALEN) == 0)
225 break;
226 }
227
228 if (peer == NULL) {
229 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
230 "retry " MACSTR, MAC2STR(dest));
231 return 0;
232 }
233
234 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
235
236 peer->sm_tmr.count = TPK_RETRY_COUNT;
237 peer->sm_tmr.timer = TPK_TIMEOUT;
238
239 /* Copy message to resend on timeout */
240 os_memcpy(peer->sm_tmr.dest, dest, ETH_ALEN);
241 peer->sm_tmr.action_code = action_code;
242 peer->sm_tmr.dialog_token = dialog_token;
243 peer->sm_tmr.status_code = status_code;
244 peer->sm_tmr.buf_len = msg_len;
245 os_free(peer->sm_tmr.buf);
246 peer->sm_tmr.buf = os_malloc(msg_len);
247 if (peer->sm_tmr.buf == NULL)
248 return -1;
249 os_memcpy(peer->sm_tmr.buf, msg, msg_len);
250
251 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout registered "
252 "(action_code=%u)", action_code);
253 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
254 wpa_tdls_tpk_retry_timeout, sm, peer);
255 return 0;
256 }
257
258
259 static int wpa_tdls_do_teardown(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
260 u16 reason_code, int free_peer)
261 {
262 int ret;
263
264 if (sm->tdls_external_setup) {
265 ret = wpa_tdls_send_teardown(sm, peer->addr, reason_code);
266
267 /* disable the link after teardown was sent */
268 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
269 } else {
270 ret = wpa_sm_tdls_oper(sm, TDLS_TEARDOWN, peer->addr);
271 }
272
273 if (sm->tdls_external_setup || free_peer)
274 wpa_tdls_peer_free(sm, peer);
275
276 return ret;
277 }
278
279
280 static void wpa_tdls_tpk_retry_timeout(void *eloop_ctx, void *timeout_ctx)
281 {
282
283 struct wpa_sm *sm = eloop_ctx;
284 struct wpa_tdls_peer *peer = timeout_ctx;
285
286 if (peer->sm_tmr.count) {
287 peer->sm_tmr.count--;
288 peer->sm_tmr.timer = TPK_TIMEOUT;
289
290 wpa_printf(MSG_INFO, "TDLS: Retrying sending of message "
291 "(action_code=%u)",
292 peer->sm_tmr.action_code);
293
294 if (peer->sm_tmr.buf == NULL) {
295 wpa_printf(MSG_INFO, "TDLS: No retry buffer available "
296 "for action_code=%u",
297 peer->sm_tmr.action_code);
298 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm,
299 peer);
300 return;
301 }
302
303 /* resend TPK Handshake Message to Peer */
304 if (wpa_tdls_send_tpk_msg(sm, peer->sm_tmr.dest,
305 peer->sm_tmr.action_code,
306 peer->sm_tmr.dialog_token,
307 peer->sm_tmr.status_code,
308 peer->sm_tmr.buf,
309 peer->sm_tmr.buf_len)) {
310 wpa_printf(MSG_INFO, "TDLS: Failed to retry "
311 "transmission");
312 }
313
314 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
315 eloop_register_timeout(peer->sm_tmr.timer / 1000, 0,
316 wpa_tdls_tpk_retry_timeout, sm, peer);
317 } else {
318 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
319
320 wpa_printf(MSG_DEBUG, "TDLS: Sending Teardown Request");
321 wpa_tdls_do_teardown(sm, peer,
322 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
323 }
324 }
325
326
327 static void wpa_tdls_tpk_retry_timeout_cancel(struct wpa_sm *sm,
328 struct wpa_tdls_peer *peer,
329 u8 action_code)
330 {
331 if (action_code == peer->sm_tmr.action_code) {
332 wpa_printf(MSG_DEBUG, "TDLS: Retry timeout cancelled for "
333 "action_code=%u", action_code);
334
335 /* Cancel Timeout registered */
336 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
337
338 /* free all resources meant for retry */
339 os_free(peer->sm_tmr.buf);
340 peer->sm_tmr.buf = NULL;
341
342 peer->sm_tmr.count = 0;
343 peer->sm_tmr.timer = 0;
344 peer->sm_tmr.buf_len = 0;
345 peer->sm_tmr.action_code = 0xff;
346 } else {
347 wpa_printf(MSG_INFO, "TDLS: Error in cancelling retry timeout "
348 "(Unknown action_code=%u)", action_code);
349 }
350 }
351
352
353 static void wpa_tdls_generate_tpk(struct wpa_tdls_peer *peer,
354 const u8 *own_addr, const u8 *bssid)
355 {
356 u8 key_input[SHA256_MAC_LEN];
357 const u8 *nonce[2];
358 size_t len[2];
359 u8 data[3 * ETH_ALEN];
360
361 /* IEEE Std 802.11z-2010 8.5.9.1:
362 * TPK-Key-Input = SHA-256(min(SNonce, ANonce) || max(SNonce, ANonce))
363 */
364 len[0] = WPA_NONCE_LEN;
365 len[1] = WPA_NONCE_LEN;
366 if (os_memcmp(peer->inonce, peer->rnonce, WPA_NONCE_LEN) < 0) {
367 nonce[0] = peer->inonce;
368 nonce[1] = peer->rnonce;
369 } else {
370 nonce[0] = peer->rnonce;
371 nonce[1] = peer->inonce;
372 }
373 wpa_hexdump(MSG_DEBUG, "TDLS: min(Nonce)", nonce[0], WPA_NONCE_LEN);
374 wpa_hexdump(MSG_DEBUG, "TDLS: max(Nonce)", nonce[1], WPA_NONCE_LEN);
375 sha256_vector(2, nonce, len, key_input);
376 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-Key-Input",
377 key_input, SHA256_MAC_LEN);
378
379 /*
380 * TPK-Key-Data = KDF-N_KEY(TPK-Key-Input, "TDLS PMK",
381 * min(MAC_I, MAC_R) || max(MAC_I, MAC_R) || BSSID || N_KEY)
382 * TODO: is N_KEY really included in KDF Context and if so, in which
383 * presentation format (little endian 16-bit?) is it used? It gets
384 * added by the KDF anyway..
385 */
386
387 if (os_memcmp(own_addr, peer->addr, ETH_ALEN) < 0) {
388 os_memcpy(data, own_addr, ETH_ALEN);
389 os_memcpy(data + ETH_ALEN, peer->addr, ETH_ALEN);
390 } else {
391 os_memcpy(data, peer->addr, ETH_ALEN);
392 os_memcpy(data + ETH_ALEN, own_addr, ETH_ALEN);
393 }
394 os_memcpy(data + 2 * ETH_ALEN, bssid, ETH_ALEN);
395 wpa_hexdump(MSG_DEBUG, "TDLS: KDF Context", data, sizeof(data));
396
397 sha256_prf(key_input, SHA256_MAC_LEN, "TDLS PMK", data, sizeof(data),
398 (u8 *) &peer->tpk, sizeof(peer->tpk));
399 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-KCK",
400 peer->tpk.kck, sizeof(peer->tpk.kck));
401 wpa_hexdump_key(MSG_DEBUG, "TDLS: TPK-TK",
402 peer->tpk.tk, sizeof(peer->tpk.tk));
403 peer->tpk_set = 1;
404 }
405
406
407 /**
408 * wpa_tdls_ftie_mic - Calculate TDLS FTIE MIC
409 * @kck: TPK-KCK
410 * @lnkid: Pointer to the beginning of Link Identifier IE
411 * @rsnie: Pointer to the beginning of RSN IE used for handshake
412 * @timeoutie: Pointer to the beginning of Timeout IE used for handshake
413 * @ftie: Pointer to the beginning of FT IE
414 * @mic: Pointer for writing MIC
415 *
416 * Calculate MIC for TDLS frame.
417 */
418 static int wpa_tdls_ftie_mic(const u8 *kck, u8 trans_seq, const u8 *lnkid,
419 const u8 *rsnie, const u8 *timeoutie,
420 const u8 *ftie, u8 *mic)
421 {
422 u8 *buf, *pos;
423 struct wpa_tdls_ftie *_ftie;
424 const struct wpa_tdls_lnkid *_lnkid;
425 int ret;
426 int len = 2 * ETH_ALEN + 1 + 2 + lnkid[1] + 2 + rsnie[1] +
427 2 + timeoutie[1] + 2 + ftie[1];
428 buf = os_zalloc(len);
429 if (!buf) {
430 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
431 return -1;
432 }
433
434 pos = buf;
435 _lnkid = (const struct wpa_tdls_lnkid *) lnkid;
436 /* 1) TDLS initiator STA MAC address */
437 os_memcpy(pos, _lnkid->init_sta, ETH_ALEN);
438 pos += ETH_ALEN;
439 /* 2) TDLS responder STA MAC address */
440 os_memcpy(pos, _lnkid->resp_sta, ETH_ALEN);
441 pos += ETH_ALEN;
442 /* 3) Transaction Sequence number */
443 *pos++ = trans_seq;
444 /* 4) Link Identifier IE */
445 os_memcpy(pos, lnkid, 2 + lnkid[1]);
446 pos += 2 + lnkid[1];
447 /* 5) RSN IE */
448 os_memcpy(pos, rsnie, 2 + rsnie[1]);
449 pos += 2 + rsnie[1];
450 /* 6) Timeout Interval IE */
451 os_memcpy(pos, timeoutie, 2 + timeoutie[1]);
452 pos += 2 + timeoutie[1];
453 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
454 os_memcpy(pos, ftie, 2 + ftie[1]);
455 _ftie = (struct wpa_tdls_ftie *) pos;
456 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
457 pos += 2 + ftie[1];
458
459 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
460 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
461 ret = omac1_aes_128(kck, buf, pos - buf, mic);
462 os_free(buf);
463 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
464 return ret;
465 }
466
467
468 /**
469 * wpa_tdls_key_mic_teardown - Calculate TDLS FTIE MIC for Teardown frame
470 * @kck: TPK-KCK
471 * @trans_seq: Transaction Sequence Number (4 - Teardown)
472 * @rcode: Reason code for Teardown
473 * @dtoken: Dialog Token used for that particular link
474 * @lnkid: Pointer to the beginning of Link Identifier IE
475 * @ftie: Pointer to the beginning of FT IE
476 * @mic: Pointer for writing MIC
477 *
478 * Calculate MIC for TDLS frame.
479 */
480 static int wpa_tdls_key_mic_teardown(const u8 *kck, u8 trans_seq, u16 rcode,
481 u8 dtoken, const u8 *lnkid,
482 const u8 *ftie, u8 *mic)
483 {
484 u8 *buf, *pos;
485 struct wpa_tdls_ftie *_ftie;
486 int ret;
487 int len;
488
489 if (lnkid == NULL)
490 return -1;
491
492 len = 2 + lnkid[1] + sizeof(rcode) + sizeof(dtoken) +
493 sizeof(trans_seq) + 2 + ftie[1];
494
495 buf = os_zalloc(len);
496 if (!buf) {
497 wpa_printf(MSG_WARNING, "TDLS: No memory for MIC calculation");
498 return -1;
499 }
500
501 pos = buf;
502 /* 1) Link Identifier IE */
503 os_memcpy(pos, lnkid, 2 + lnkid[1]);
504 pos += 2 + lnkid[1];
505 /* 2) Reason Code */
506 WPA_PUT_LE16(pos, rcode);
507 pos += sizeof(rcode);
508 /* 3) Dialog token */
509 *pos++ = dtoken;
510 /* 4) Transaction Sequence number */
511 *pos++ = trans_seq;
512 /* 7) FTIE, with the MIC field of the FTIE set to 0 */
513 os_memcpy(pos, ftie, 2 + ftie[1]);
514 _ftie = (struct wpa_tdls_ftie *) pos;
515 os_memset(_ftie->mic, 0, TDLS_MIC_LEN);
516 pos += 2 + ftie[1];
517
518 wpa_hexdump(MSG_DEBUG, "TDLS: Data for FTIE MIC", buf, pos - buf);
519 wpa_hexdump_key(MSG_DEBUG, "TDLS: KCK", kck, 16);
520 ret = omac1_aes_128(kck, buf, pos - buf, mic);
521 os_free(buf);
522 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE MIC", mic, 16);
523 return ret;
524 }
525
526
527 static int wpa_supplicant_verify_tdls_mic(u8 trans_seq,
528 struct wpa_tdls_peer *peer,
529 const u8 *lnkid, const u8 *timeoutie,
530 const struct wpa_tdls_ftie *ftie)
531 {
532 u8 mic[16];
533
534 if (peer->tpk_set) {
535 wpa_tdls_ftie_mic(peer->tpk.kck, trans_seq, lnkid,
536 peer->rsnie_p, timeoutie, (u8 *) ftie,
537 mic);
538 if (os_memcmp(mic, ftie->mic, 16) != 0) {
539 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in FTIE - "
540 "dropping packet");
541 wpa_hexdump(MSG_DEBUG, "TDLS: Received MIC",
542 ftie->mic, 16);
543 wpa_hexdump(MSG_DEBUG, "TDLS: Calculated MIC",
544 mic, 16);
545 return -1;
546 }
547 } else {
548 wpa_printf(MSG_WARNING, "TDLS: Could not verify TDLS MIC, "
549 "TPK not set - dropping packet");
550 return -1;
551 }
552 return 0;
553 }
554
555
556 static int wpa_supplicant_verify_tdls_mic_teardown(
557 u8 trans_seq, u16 rcode, u8 dtoken, struct wpa_tdls_peer *peer,
558 const u8 *lnkid, const struct wpa_tdls_ftie *ftie)
559 {
560 u8 mic[16];
561
562 if (peer->tpk_set) {
563 wpa_tdls_key_mic_teardown(peer->tpk.kck, trans_seq, rcode,
564 dtoken, lnkid, (u8 *) ftie, mic);
565 if (os_memcmp(mic, ftie->mic, 16) != 0) {
566 wpa_printf(MSG_INFO, "TDLS: Invalid MIC in Teardown - "
567 "dropping packet");
568 return -1;
569 }
570 } else {
571 wpa_printf(MSG_INFO, "TDLS: Could not verify TDLS Teardown "
572 "MIC, TPK not set - dropping packet");
573 return -1;
574 }
575 return 0;
576 }
577
578
579 static void wpa_tdls_tpk_timeout(void *eloop_ctx, void *timeout_ctx)
580 {
581 struct wpa_sm *sm = eloop_ctx;
582 struct wpa_tdls_peer *peer = timeout_ctx;
583
584 /*
585 * On TPK lifetime expiration, we have an option of either tearing down
586 * the direct link or trying to re-initiate it. The selection of what
587 * to do is not strictly speaking controlled by our role in the expired
588 * link, but for now, use that to select whether to renew or tear down
589 * the link.
590 */
591
592 if (peer->initiator) {
593 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
594 " - try to renew", MAC2STR(peer->addr));
595 wpa_tdls_start(sm, peer->addr);
596 } else {
597 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime expired for " MACSTR
598 " - tear down", MAC2STR(peer->addr));
599 wpa_tdls_do_teardown(sm, peer,
600 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 1);
601 }
602 }
603
604
605 static void wpa_tdls_peer_free(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
606 {
607 wpa_printf(MSG_DEBUG, "TDLS: Clear state for peer " MACSTR,
608 MAC2STR(peer->addr));
609 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
610 eloop_cancel_timeout(wpa_tdls_tpk_retry_timeout, sm, peer);
611 peer->initiator = 0;
612 os_free(peer->sm_tmr.buf);
613 peer->sm_tmr.buf = NULL;
614 peer->rsnie_i_len = peer->rsnie_p_len = 0;
615 peer->cipher = 0;
616 peer->tpk_set = peer->tpk_success = 0;
617 os_memset(&peer->tpk, 0, sizeof(peer->tpk));
618 os_memset(peer->inonce, 0, WPA_NONCE_LEN);
619 os_memset(peer->rnonce, 0, WPA_NONCE_LEN);
620 }
621
622
623 static void wpa_tdls_linkid(struct wpa_sm *sm, struct wpa_tdls_peer *peer,
624 struct wpa_tdls_lnkid *lnkid)
625 {
626 lnkid->ie_type = WLAN_EID_LINK_ID;
627 lnkid->ie_len = 3 * ETH_ALEN;
628 os_memcpy(lnkid->bssid, sm->bssid, ETH_ALEN);
629 if (peer->initiator) {
630 os_memcpy(lnkid->init_sta, sm->own_addr, ETH_ALEN);
631 os_memcpy(lnkid->resp_sta, peer->addr, ETH_ALEN);
632 } else {
633 os_memcpy(lnkid->init_sta, peer->addr, ETH_ALEN);
634 os_memcpy(lnkid->resp_sta, sm->own_addr, ETH_ALEN);
635 }
636 }
637
638
639 int wpa_tdls_send_teardown(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
640 {
641 struct wpa_tdls_peer *peer;
642 struct wpa_tdls_ftie *ftie;
643 struct wpa_tdls_lnkid lnkid;
644 u8 dialog_token;
645 u8 *rbuf, *pos;
646 int ielen;
647
648 if (sm->tdls_disabled || !sm->tdls_supported)
649 return -1;
650
651 /* Find the node and free from the list */
652 for (peer = sm->tdls; peer; peer = peer->next) {
653 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
654 break;
655 }
656
657 if (peer == NULL) {
658 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
659 "Teardown " MACSTR, MAC2STR(addr));
660 return 0;
661 }
662
663 dialog_token = peer->dtoken;
664
665 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown for " MACSTR,
666 MAC2STR(addr));
667
668 ielen = 0;
669 if (wpa_tdls_get_privacy(sm) && peer->tpk_set && peer->tpk_success) {
670 /* To add FTIE for Teardown request and compute MIC */
671 ielen += sizeof(*ftie);
672 #ifdef CONFIG_TDLS_TESTING
673 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
674 ielen += 170;
675 #endif /* CONFIG_TDLS_TESTING */
676 }
677
678 rbuf = os_zalloc(ielen + 1);
679 if (rbuf == NULL)
680 return -1;
681 pos = rbuf;
682
683 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
684 goto skip_ies;
685
686 ftie = (struct wpa_tdls_ftie *) pos;
687 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
688 /* Using the recent nonce which should be for CONFIRM frame */
689 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
690 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
691 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
692 pos = (u8 *) (ftie + 1);
693 #ifdef CONFIG_TDLS_TESTING
694 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
695 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
696 "FTIE");
697 ftie->ie_len += 170;
698 *pos++ = 255; /* FTIE subelem */
699 *pos++ = 168; /* FTIE subelem length */
700 pos += 168;
701 }
702 #endif /* CONFIG_TDLS_TESTING */
703 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TDLS Teardown handshake",
704 (u8 *) ftie, pos - (u8 *) ftie);
705
706 /* compute MIC before sending */
707 wpa_tdls_linkid(sm, peer, &lnkid);
708 wpa_tdls_key_mic_teardown(peer->tpk.kck, 4, reason_code,
709 dialog_token, (u8 *) &lnkid, (u8 *) ftie,
710 ftie->mic);
711
712 skip_ies:
713 /* TODO: register for a Timeout handler, if Teardown is not received at
714 * the other end, then try again another time */
715
716 /* request driver to send Teardown using this FTIE */
717 wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_TEARDOWN, 0,
718 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, rbuf,
719 pos - rbuf);
720 os_free(rbuf);
721
722 /* clear the Peerkey statemachine */
723 wpa_tdls_peer_free(sm, peer);
724
725 return 0;
726 }
727
728
729 int wpa_tdls_teardown_link(struct wpa_sm *sm, const u8 *addr, u16 reason_code)
730 {
731 struct wpa_tdls_peer *peer;
732
733 if (sm->tdls_disabled || !sm->tdls_supported)
734 return -1;
735
736 for (peer = sm->tdls; peer; peer = peer->next) {
737 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
738 break;
739 }
740
741 if (peer == NULL) {
742 wpa_printf(MSG_DEBUG, "TDLS: Could not find peer " MACSTR
743 " for link Teardown", MAC2STR(addr));
744 return -1;
745 }
746
747 if (!peer->tpk_success) {
748 wpa_printf(MSG_DEBUG, "TDLS: Peer " MACSTR
749 " not connected - cannot Teardown link", MAC2STR(addr));
750 return -1;
751 }
752
753 return wpa_tdls_do_teardown(sm, peer, reason_code, 0);
754 }
755
756
757 void wpa_tdls_disable_link(struct wpa_sm *sm, const u8 *addr)
758 {
759 struct wpa_tdls_peer *peer;
760
761 for (peer = sm->tdls; peer; peer = peer->next) {
762 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
763 break;
764 }
765
766 if (peer) {
767 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, addr);
768 wpa_tdls_peer_free(sm, peer);
769 }
770 }
771
772
773 static int wpa_tdls_recv_teardown(struct wpa_sm *sm, const u8 *src_addr,
774 const u8 *buf, size_t len)
775 {
776 struct wpa_tdls_peer *peer = NULL;
777 struct wpa_tdls_ftie *ftie;
778 struct wpa_tdls_lnkid *lnkid;
779 struct wpa_eapol_ie_parse kde;
780 u16 reason_code;
781 const u8 *pos;
782 int ielen;
783
784 /* Find the node and free from the list */
785 for (peer = sm->tdls; peer; peer = peer->next) {
786 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
787 break;
788 }
789
790 if (peer == NULL) {
791 wpa_printf(MSG_INFO, "TDLS: No matching entry found for "
792 "Teardown " MACSTR, MAC2STR(src_addr));
793 return 0;
794 }
795
796 pos = buf;
797 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
798
799 reason_code = WPA_GET_LE16(pos);
800 pos += 2;
801
802 wpa_printf(MSG_DEBUG, "TDLS: TDLS Teardown Request from " MACSTR
803 " (reason code %u)", MAC2STR(src_addr), reason_code);
804
805 ielen = len - (pos - buf); /* start of IE in buf */
806 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
807 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in Teardown");
808 return -1;
809 }
810
811 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
812 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TDLS "
813 "Teardown");
814 return -1;
815 }
816 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
817
818 if (!wpa_tdls_get_privacy(sm) || !peer->tpk_set || !peer->tpk_success)
819 goto skip_ftie;
820
821 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
822 wpa_printf(MSG_INFO, "TDLS: No FTIE in TDLS Teardown");
823 return -1;
824 }
825
826 ftie = (struct wpa_tdls_ftie *) kde.ftie;
827
828 /* Process MIC check to see if TDLS Teardown is right */
829 if (wpa_supplicant_verify_tdls_mic_teardown(4, reason_code,
830 peer->dtoken, peer,
831 (u8 *) lnkid, ftie) < 0) {
832 wpa_printf(MSG_DEBUG, "TDLS: MIC failure for TDLS "
833 "Teardown Request from " MACSTR, MAC2STR(src_addr));
834 return -1;
835 }
836
837 skip_ftie:
838 /*
839 * Request the driver to disable the direct link and clear associated
840 * keys.
841 */
842 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
843
844 /* clear the Peerkey statemachine */
845 wpa_tdls_peer_free(sm, peer);
846
847 return 0;
848 }
849
850
851 /**
852 * wpa_tdls_send_error - To send suitable TDLS status response with
853 * appropriate status code mentioning reason for error/failure.
854 * @dst - MAC addr of Peer station
855 * @tdls_action - TDLS frame type for which error code is sent
856 * @status - status code mentioning reason
857 */
858
859 static int wpa_tdls_send_error(struct wpa_sm *sm, const u8 *dst,
860 u8 tdls_action, u8 dialog_token, u16 status)
861 {
862 wpa_printf(MSG_DEBUG, "TDLS: Sending error to " MACSTR
863 " (action=%u status=%u)",
864 MAC2STR(dst), tdls_action, status);
865 return wpa_tdls_tpk_send(sm, dst, tdls_action, dialog_token, status,
866 NULL, 0);
867 }
868
869
870 static struct wpa_tdls_peer *
871 wpa_tdls_add_peer(struct wpa_sm *sm, const u8 *addr)
872 {
873 struct wpa_tdls_peer *peer;
874
875 wpa_printf(MSG_INFO, "TDLS: Creating peer entry for " MACSTR,
876 MAC2STR(addr));
877
878 peer = os_zalloc(sizeof(*peer));
879 if (peer == NULL)
880 return NULL;
881
882 os_memcpy(peer->addr, addr, ETH_ALEN);
883 peer->next = sm->tdls;
884 sm->tdls = peer;
885
886 return peer;
887 }
888
889
890 static int wpa_tdls_send_tpk_m1(struct wpa_sm *sm,
891 struct wpa_tdls_peer *peer)
892 {
893 size_t buf_len;
894 struct wpa_tdls_timeoutie timeoutie;
895 u16 rsn_capab;
896 struct wpa_tdls_ftie *ftie;
897 u8 *rbuf, *pos, *count_pos;
898 u16 count;
899 struct rsn_ie_hdr *hdr;
900
901 if (!wpa_tdls_get_privacy(sm)) {
902 wpa_printf(MSG_DEBUG, "TDLS: No security used on the link");
903 peer->rsnie_i_len = 0;
904 goto skip_rsnie;
905 }
906
907 /*
908 * TPK Handshake Message 1:
909 * FTIE: ANonce=0, SNonce=initiator nonce MIC=0, DataKDs=(RSNIE_I,
910 * Timeout Interval IE))
911 */
912
913 /* Filling RSN IE */
914 hdr = (struct rsn_ie_hdr *) peer->rsnie_i;
915 hdr->elem_id = WLAN_EID_RSN;
916 WPA_PUT_LE16(hdr->version, RSN_VERSION);
917
918 pos = (u8 *) (hdr + 1);
919 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
920 pos += RSN_SELECTOR_LEN;
921 count_pos = pos;
922 pos += 2;
923
924 count = 0;
925
926 /*
927 * AES-CCMP is the default Encryption preferred for TDLS, so
928 * RSN IE is filled only with CCMP CIPHER
929 * Note: TKIP is not used to encrypt TDLS link.
930 *
931 * Regardless of the cipher used on the AP connection, select CCMP
932 * here.
933 */
934 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
935 pos += RSN_SELECTOR_LEN;
936 count++;
937
938 WPA_PUT_LE16(count_pos, count);
939
940 WPA_PUT_LE16(pos, 1);
941 pos += 2;
942 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
943 pos += RSN_SELECTOR_LEN;
944
945 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
946 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
947 #ifdef CONFIG_TDLS_TESTING
948 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
949 wpa_printf(MSG_DEBUG, "TDLS: Use alternative RSN IE for "
950 "testing");
951 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
952 }
953 #endif /* CONFIG_TDLS_TESTING */
954 WPA_PUT_LE16(pos, rsn_capab);
955 pos += 2;
956 #ifdef CONFIG_TDLS_TESTING
957 if (tdls_testing & TDLS_TESTING_ALT_RSN_IE) {
958 /* Number of PMKIDs */
959 *pos++ = 0x00;
960 *pos++ = 0x00;
961 }
962 #endif /* CONFIG_TDLS_TESTING */
963
964 hdr->len = (pos - peer->rsnie_i) - 2;
965 peer->rsnie_i_len = pos - peer->rsnie_i;
966 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
967 peer->rsnie_i, peer->rsnie_i_len);
968
969 skip_rsnie:
970 buf_len = 0;
971 if (wpa_tdls_get_privacy(sm))
972 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
973 sizeof(struct wpa_tdls_timeoutie);
974 #ifdef CONFIG_TDLS_TESTING
975 if (wpa_tdls_get_privacy(sm) &&
976 (tdls_testing & TDLS_TESTING_LONG_FRAME))
977 buf_len += 170;
978 if (tdls_testing & TDLS_TESTING_DIFF_BSSID)
979 buf_len += sizeof(struct wpa_tdls_lnkid);
980 #endif /* CONFIG_TDLS_TESTING */
981 rbuf = os_zalloc(buf_len + 1);
982 if (rbuf == NULL) {
983 wpa_tdls_peer_free(sm, peer);
984 return -1;
985 }
986 pos = rbuf;
987
988 if (!wpa_tdls_get_privacy(sm))
989 goto skip_ies;
990
991 /* Initiator RSN IE */
992 pos = wpa_add_ie(pos, peer->rsnie_i, peer->rsnie_i_len);
993
994 ftie = (struct wpa_tdls_ftie *) pos;
995 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
996 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
997
998 if (os_get_random(peer->inonce, WPA_NONCE_LEN)) {
999 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1000 "TDLS: Failed to get random data for initiator Nonce");
1001 os_free(rbuf);
1002 wpa_tdls_peer_free(sm, peer);
1003 return -1;
1004 }
1005 wpa_hexdump(MSG_DEBUG, "TDLS: Initiator Nonce for TPK handshake",
1006 peer->inonce, WPA_NONCE_LEN);
1007 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1008
1009 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK Handshake M1",
1010 (u8 *) ftie, sizeof(struct wpa_tdls_ftie));
1011
1012 pos = (u8 *) (ftie + 1);
1013
1014 #ifdef CONFIG_TDLS_TESTING
1015 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1016 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1017 "FTIE");
1018 ftie->ie_len += 170;
1019 *pos++ = 255; /* FTIE subelem */
1020 *pos++ = 168; /* FTIE subelem length */
1021 pos += 168;
1022 }
1023 #endif /* CONFIG_TDLS_TESTING */
1024
1025 /* Lifetime */
1026 peer->lifetime = TPK_LIFETIME;
1027 #ifdef CONFIG_TDLS_TESTING
1028 if (tdls_testing & TDLS_TESTING_SHORT_LIFETIME) {
1029 wpa_printf(MSG_DEBUG, "TDLS: Testing - use short TPK "
1030 "lifetime");
1031 peer->lifetime = 301;
1032 }
1033 if (tdls_testing & TDLS_TESTING_LONG_LIFETIME) {
1034 wpa_printf(MSG_DEBUG, "TDLS: Testing - use long TPK "
1035 "lifetime");
1036 peer->lifetime = 0xffffffff;
1037 }
1038 #endif /* CONFIG_TDLS_TESTING */
1039 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1040 sizeof(timeoutie), peer->lifetime);
1041 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", peer->lifetime);
1042
1043 skip_ies:
1044
1045 #ifdef CONFIG_TDLS_TESTING
1046 if (tdls_testing & TDLS_TESTING_DIFF_BSSID) {
1047 wpa_printf(MSG_DEBUG, "TDLS: Testing - use incorrect BSSID in "
1048 "Link Identifier");
1049 struct wpa_tdls_lnkid *l = (struct wpa_tdls_lnkid *) pos;
1050 wpa_tdls_linkid(sm, peer, l);
1051 l->bssid[5] ^= 0x01;
1052 pos += sizeof(*l);
1053 }
1054 #endif /* CONFIG_TDLS_TESTING */
1055
1056 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Request / TPK "
1057 "Handshake Message 1 (peer " MACSTR ")",
1058 MAC2STR(peer->addr));
1059
1060 wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_SETUP_REQUEST, 1, 0,
1061 rbuf, pos - rbuf);
1062 os_free(rbuf);
1063
1064 return 0;
1065 }
1066
1067
1068 static int wpa_tdls_send_tpk_m2(struct wpa_sm *sm,
1069 const unsigned char *src_addr, u8 dtoken,
1070 struct wpa_tdls_lnkid *lnkid,
1071 const struct wpa_tdls_peer *peer)
1072 {
1073 u8 *rbuf, *pos;
1074 size_t buf_len;
1075 u32 lifetime;
1076 struct wpa_tdls_timeoutie timeoutie;
1077 struct wpa_tdls_ftie *ftie;
1078
1079 buf_len = 0;
1080 if (wpa_tdls_get_privacy(sm)) {
1081 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1082 * Lifetime */
1083 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1084 sizeof(struct wpa_tdls_timeoutie);
1085 #ifdef CONFIG_TDLS_TESTING
1086 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1087 buf_len += 170;
1088 #endif /* CONFIG_TDLS_TESTING */
1089 }
1090
1091 rbuf = os_zalloc(buf_len + 1);
1092 if (rbuf == NULL)
1093 return -1;
1094 pos = rbuf;
1095
1096 if (!wpa_tdls_get_privacy(sm))
1097 goto skip_ies;
1098
1099 /* Peer RSN IE */
1100 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1101
1102 ftie = (struct wpa_tdls_ftie *) pos;
1103 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1104 /* TODO: ftie->mic_control to set 2-RESPONSE */
1105 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1106 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1107 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1108 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE for TPK M2",
1109 (u8 *) ftie, sizeof(*ftie));
1110
1111 pos = (u8 *) (ftie + 1);
1112
1113 #ifdef CONFIG_TDLS_TESTING
1114 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1115 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1116 "FTIE");
1117 ftie->ie_len += 170;
1118 *pos++ = 255; /* FTIE subelem */
1119 *pos++ = 168; /* FTIE subelem length */
1120 pos += 168;
1121 }
1122 #endif /* CONFIG_TDLS_TESTING */
1123
1124 /* Lifetime */
1125 lifetime = peer->lifetime;
1126 #ifdef CONFIG_TDLS_TESTING
1127 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_RESP) {
1128 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1129 "lifetime in response");
1130 lifetime++;
1131 }
1132 #endif /* CONFIG_TDLS_TESTING */
1133 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1134 sizeof(timeoutie), lifetime);
1135 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds from initiator",
1136 lifetime);
1137
1138 /* compute MIC before sending */
1139 wpa_tdls_ftie_mic(peer->tpk.kck, 2, (u8 *) lnkid, peer->rsnie_p,
1140 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1141
1142 skip_ies:
1143 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken, 0,
1144 rbuf, pos - rbuf);
1145 os_free(rbuf);
1146
1147 return 0;
1148 }
1149
1150
1151 static int wpa_tdls_send_tpk_m3(struct wpa_sm *sm,
1152 const unsigned char *src_addr, u8 dtoken,
1153 struct wpa_tdls_lnkid *lnkid,
1154 const struct wpa_tdls_peer *peer)
1155 {
1156 u8 *rbuf, *pos;
1157 size_t buf_len;
1158 struct wpa_tdls_ftie *ftie;
1159 struct wpa_tdls_timeoutie timeoutie;
1160 u32 lifetime;
1161
1162 buf_len = 0;
1163 if (wpa_tdls_get_privacy(sm)) {
1164 /* Peer RSN IE, FTIE(Initiator Nonce, Responder Nonce),
1165 * Lifetime */
1166 buf_len += peer->rsnie_i_len + sizeof(struct wpa_tdls_ftie) +
1167 sizeof(struct wpa_tdls_timeoutie);
1168 #ifdef CONFIG_TDLS_TESTING
1169 if (tdls_testing & TDLS_TESTING_LONG_FRAME)
1170 buf_len += 170;
1171 #endif /* CONFIG_TDLS_TESTING */
1172 }
1173
1174 rbuf = os_zalloc(buf_len + 1);
1175 if (rbuf == NULL)
1176 return -1;
1177 pos = rbuf;
1178
1179 if (!wpa_tdls_get_privacy(sm))
1180 goto skip_ies;
1181
1182 /* Peer RSN IE */
1183 pos = wpa_add_ie(pos, peer->rsnie_p, peer->rsnie_p_len);
1184
1185 ftie = (struct wpa_tdls_ftie *) pos;
1186 ftie->ie_type = WLAN_EID_FAST_BSS_TRANSITION;
1187 /*TODO: ftie->mic_control to set 3-CONFIRM */
1188 os_memcpy(ftie->Anonce, peer->rnonce, WPA_NONCE_LEN);
1189 os_memcpy(ftie->Snonce, peer->inonce, WPA_NONCE_LEN);
1190 ftie->ie_len = sizeof(struct wpa_tdls_ftie) - 2;
1191
1192 pos = (u8 *) (ftie + 1);
1193
1194 #ifdef CONFIG_TDLS_TESTING
1195 if (tdls_testing & TDLS_TESTING_LONG_FRAME) {
1196 wpa_printf(MSG_DEBUG, "TDLS: Testing - add extra subelem to "
1197 "FTIE");
1198 ftie->ie_len += 170;
1199 *pos++ = 255; /* FTIE subelem */
1200 *pos++ = 168; /* FTIE subelem length */
1201 pos += 168;
1202 }
1203 #endif /* CONFIG_TDLS_TESTING */
1204
1205 /* Lifetime */
1206 lifetime = peer->lifetime;
1207 #ifdef CONFIG_TDLS_TESTING
1208 if (tdls_testing & TDLS_TESTING_WRONG_LIFETIME_CONF) {
1209 wpa_printf(MSG_DEBUG, "TDLS: Testing - use wrong TPK "
1210 "lifetime in confirm");
1211 lifetime++;
1212 }
1213 #endif /* CONFIG_TDLS_TESTING */
1214 pos = wpa_add_tdls_timeoutie(pos, (u8 *) &timeoutie,
1215 sizeof(timeoutie), lifetime);
1216 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds",
1217 lifetime);
1218
1219 /* compute MIC before sending */
1220 wpa_tdls_ftie_mic(peer->tpk.kck, 3, (u8 *) lnkid, peer->rsnie_p,
1221 (u8 *) &timeoutie, (u8 *) ftie, ftie->mic);
1222
1223 skip_ies:
1224 wpa_tdls_tpk_send(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken, 0,
1225 rbuf, pos - rbuf);
1226 os_free(rbuf);
1227
1228 return 0;
1229 }
1230
1231
1232 static int wpa_tdls_send_discovery_response(struct wpa_sm *sm,
1233 struct wpa_tdls_peer *peer,
1234 u8 dialog_token)
1235 {
1236 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Discovery Response "
1237 "(peer " MACSTR ")", MAC2STR(peer->addr));
1238
1239 return wpa_tdls_tpk_send(sm, peer->addr, WLAN_TDLS_DISCOVERY_RESPONSE,
1240 dialog_token, 0, NULL, 0);
1241 }
1242
1243
1244 static int
1245 wpa_tdls_process_discovery_request(struct wpa_sm *sm, const u8 *addr,
1246 const u8 *buf, size_t len)
1247 {
1248 struct wpa_eapol_ie_parse kde;
1249 const struct wpa_tdls_lnkid *lnkid;
1250 struct wpa_tdls_peer *peer;
1251 size_t min_req_len = sizeof(struct wpa_tdls_frame) +
1252 1 /* dialog token */ + sizeof(struct wpa_tdls_lnkid);
1253 u8 dialog_token;
1254
1255 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from " MACSTR,
1256 MAC2STR(addr));
1257
1258 if (len < min_req_len) {
1259 wpa_printf(MSG_DEBUG, "TDLS Discovery Request is too short: "
1260 "%d", (int) len);
1261 return -1;
1262 }
1263
1264 dialog_token = buf[sizeof(struct wpa_tdls_frame)];
1265
1266 if (wpa_supplicant_parse_ies(buf + sizeof(struct wpa_tdls_frame) + 1,
1267 len - (sizeof(struct wpa_tdls_frame) + 1),
1268 &kde) < 0)
1269 return -1;
1270
1271 if (!kde.lnkid) {
1272 wpa_printf(MSG_DEBUG, "TDLS: Link ID not found in Discovery "
1273 "Request");
1274 return -1;
1275 }
1276
1277 lnkid = (const struct wpa_tdls_lnkid *) kde.lnkid;
1278
1279 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1280 wpa_printf(MSG_DEBUG, "TDLS: Discovery Request from different "
1281 " BSS " MACSTR, MAC2STR(lnkid->bssid));
1282 return -1;
1283 }
1284 /* Find existing entry and if found, use that instead of adding
1285 * a new one */
1286 for (peer = sm->tdls; peer; peer = peer->next) {
1287 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
1288 break;
1289 }
1290 if (peer == NULL) {
1291 peer = wpa_tdls_add_peer(sm, addr);
1292 if (peer == NULL)
1293 return -1;
1294 }
1295
1296 return wpa_tdls_send_discovery_response(sm, peer, dialog_token);
1297 }
1298
1299
1300 int wpa_tdls_send_discovery_request(struct wpa_sm *sm, const u8 *addr)
1301 {
1302 if (sm->tdls_disabled || !sm->tdls_supported)
1303 return -1;
1304
1305 wpa_printf(MSG_DEBUG, "TDLS: Sending Discovery Request to peer "
1306 MACSTR, MAC2STR(addr));
1307 return wpa_tdls_tpk_send(sm, addr, WLAN_TDLS_DISCOVERY_REQUEST,
1308 1, 0, NULL, 0);
1309 }
1310
1311
1312 static int copy_supp_rates(const struct wpa_eapol_ie_parse *kde,
1313 struct wpa_tdls_peer *peer)
1314 {
1315 if (!kde->supp_rates) {
1316 wpa_printf(MSG_DEBUG, "TDLS: No supported rates received");
1317 return -1;
1318 }
1319 peer->supp_rates_len = merge_byte_arrays(
1320 peer->supp_rates, sizeof(peer->supp_rates),
1321 kde->supp_rates + 2, kde->supp_rates_len - 2,
1322 kde->ext_supp_rates + 2, kde->ext_supp_rates_len - 2);
1323 return 0;
1324 }
1325
1326
1327 static int wpa_tdls_process_tpk_m1(struct wpa_sm *sm, const u8 *src_addr,
1328 const u8 *buf, size_t len)
1329 {
1330 struct wpa_tdls_peer *peer;
1331 struct wpa_eapol_ie_parse kde;
1332 struct wpa_ie_data ie;
1333 int cipher;
1334 const u8 *cpos;
1335 struct wpa_tdls_ftie *ftie = NULL;
1336 struct wpa_tdls_timeoutie *timeoutie;
1337 struct wpa_tdls_lnkid *lnkid;
1338 u32 lifetime = 0;
1339 #if 0
1340 struct rsn_ie_hdr *hdr;
1341 u8 *pos;
1342 u16 rsn_capab;
1343 u16 rsn_ver;
1344 #endif
1345 u8 dtoken;
1346 u16 ielen;
1347 u16 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1348 int tdls_prohibited = sm->tdls_prohibited;
1349 int existing_peer = 0;
1350
1351 if (len < 3 + 3)
1352 return -1;
1353
1354 cpos = buf;
1355 cpos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1356
1357 /* driver had already verified the frame format */
1358 dtoken = *cpos++; /* dialog token */
1359
1360 wpa_printf(MSG_INFO, "TDLS: Dialog Token in TPK M1 %d", dtoken);
1361
1362 for (peer = sm->tdls; peer; peer = peer->next) {
1363 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0) {
1364 existing_peer = 1;
1365 break;
1366 }
1367 }
1368
1369 if (peer == NULL) {
1370 peer = wpa_tdls_add_peer(sm, src_addr);
1371 if (peer == NULL)
1372 goto error;
1373 }
1374
1375 /* capability information */
1376 peer->capability = WPA_GET_LE16(cpos);
1377 cpos += 2;
1378
1379 ielen = len - (cpos - buf); /* start of IE in buf */
1380 if (wpa_supplicant_parse_ies(cpos, ielen, &kde) < 0) {
1381 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M1");
1382 goto error;
1383 }
1384
1385 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1386 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1387 "TPK M1");
1388 goto error;
1389 }
1390 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M1",
1391 kde.lnkid, kde.lnkid_len);
1392 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1393 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1394 wpa_printf(MSG_INFO, "TDLS: TPK M1 from diff BSS");
1395 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1396 goto error;
1397 }
1398
1399 wpa_printf(MSG_DEBUG, "TDLS: TPK M1 - TPK initiator " MACSTR,
1400 MAC2STR(src_addr));
1401
1402 if (copy_supp_rates(&kde, peer) < 0)
1403 goto error;
1404
1405 #ifdef CONFIG_TDLS_TESTING
1406 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1407 for (peer = sm->tdls; peer; peer = peer->next) {
1408 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1409 break;
1410 }
1411 if (peer == NULL) {
1412 peer = wpa_tdls_add_peer(sm, src_addr);
1413 if (peer == NULL)
1414 goto error;
1415 }
1416 wpa_printf(MSG_DEBUG, "TDLS: Testing concurrent initiation of "
1417 "TDLS setup - send own request");
1418 peer->initiator = 1;
1419 wpa_tdls_send_tpk_m1(sm, peer);
1420 }
1421
1422 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
1423 tdls_prohibited) {
1424 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
1425 "on TDLS");
1426 tdls_prohibited = 0;
1427 }
1428 #endif /* CONFIG_TDLS_TESTING */
1429
1430 if (tdls_prohibited) {
1431 wpa_printf(MSG_INFO, "TDLS: TDLS prohibited in this BSS");
1432 status = WLAN_STATUS_REQUEST_DECLINED;
1433 goto error;
1434 }
1435
1436 if (!wpa_tdls_get_privacy(sm)) {
1437 if (kde.rsn_ie) {
1438 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M1 while "
1439 "security is disabled");
1440 status = WLAN_STATUS_SECURITY_DISABLED;
1441 goto error;
1442 }
1443 goto skip_rsn;
1444 }
1445
1446 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1447 kde.rsn_ie == NULL) {
1448 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M1");
1449 status = WLAN_STATUS_INVALID_PARAMETERS;
1450 goto error;
1451 }
1452
1453 if (kde.rsn_ie_len > TDLS_MAX_IE_LEN) {
1454 wpa_printf(MSG_INFO, "TDLS: Too long Initiator RSN IE in "
1455 "TPK M1");
1456 status = WLAN_STATUS_INVALID_RSNIE;
1457 goto error;
1458 }
1459
1460 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1461 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M1");
1462 status = WLAN_STATUS_INVALID_RSNIE;
1463 goto error;
1464 }
1465
1466 cipher = ie.pairwise_cipher;
1467 if (cipher & WPA_CIPHER_CCMP) {
1468 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1469 cipher = WPA_CIPHER_CCMP;
1470 } else {
1471 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M1");
1472 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1473 goto error;
1474 }
1475
1476 if ((ie.capabilities &
1477 (WPA_CAPABILITY_NO_PAIRWISE | WPA_CAPABILITY_PEERKEY_ENABLED)) !=
1478 WPA_CAPABILITY_PEERKEY_ENABLED) {
1479 wpa_printf(MSG_INFO, "TDLS: Invalid RSN Capabilities in "
1480 "TPK M1");
1481 status = WLAN_STATUS_INVALID_RSN_IE_CAPAB;
1482 goto error;
1483 }
1484
1485 /* Lifetime */
1486 if (kde.key_lifetime == NULL) {
1487 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M1");
1488 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1489 goto error;
1490 }
1491 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1492 lifetime = WPA_GET_LE32(timeoutie->value);
1493 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds", lifetime);
1494 if (lifetime < 300) {
1495 wpa_printf(MSG_INFO, "TDLS: Too short TPK lifetime");
1496 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1497 goto error;
1498 }
1499
1500 skip_rsn:
1501 /* If found, use existing entry instead of adding a new one;
1502 * how to handle the case where both ends initiate at the
1503 * same time? */
1504 if (existing_peer) {
1505 if (peer->tpk_success) {
1506 wpa_printf(MSG_DEBUG, "TDLS: TDLS Setup Request while "
1507 "direct link is enabled - tear down the "
1508 "old link first");
1509 #if 0
1510 /* TODO: Disabling the link would be more proper
1511 * operation here, but it seems to trigger a race with
1512 * some drivers handling the new request frame. */
1513 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1514 #else
1515 if (sm->tdls_external_setup)
1516 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK,
1517 src_addr);
1518 else
1519 wpa_tdls_del_key(sm, peer);
1520 #endif
1521 wpa_tdls_peer_free(sm, peer);
1522 }
1523
1524 /*
1525 * An entry is already present, so check if we already sent a
1526 * TDLS Setup Request. If so, compare MAC addresses and let the
1527 * STA with the lower MAC address continue as the initiator.
1528 * The other negotiation is terminated.
1529 */
1530 if (peer->initiator) {
1531 if (os_memcmp(sm->own_addr, src_addr, ETH_ALEN) < 0) {
1532 wpa_printf(MSG_DEBUG, "TDLS: Discard request "
1533 "from peer with higher address "
1534 MACSTR, MAC2STR(src_addr));
1535 return -1;
1536 } else {
1537 wpa_printf(MSG_DEBUG, "TDLS: Accept request "
1538 "from peer with lower address "
1539 MACSTR " (terminate previously "
1540 "initiated negotiation",
1541 MAC2STR(src_addr));
1542 wpa_tdls_peer_free(sm, peer);
1543 }
1544 }
1545 }
1546
1547 #ifdef CONFIG_TDLS_TESTING
1548 if (tdls_testing & TDLS_TESTING_CONCURRENT_INIT) {
1549 if (os_memcmp(sm->own_addr, peer->addr, ETH_ALEN) < 0) {
1550 /*
1551 * The request frame from us is going to win, so do not
1552 * replace information based on this request frame from
1553 * the peer.
1554 */
1555 goto skip_rsn_check;
1556 }
1557 }
1558 #endif /* CONFIG_TDLS_TESTING */
1559
1560 peer->initiator = 0; /* Need to check */
1561 peer->dtoken = dtoken;
1562
1563 if (!wpa_tdls_get_privacy(sm)) {
1564 peer->rsnie_i_len = 0;
1565 peer->rsnie_p_len = 0;
1566 peer->cipher = WPA_CIPHER_NONE;
1567 goto skip_rsn_check;
1568 }
1569
1570 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1571 os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
1572 os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
1573 peer->rsnie_i_len = kde.rsn_ie_len;
1574 peer->cipher = cipher;
1575
1576 if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
1577 wpa_msg(sm->ctx->ctx, MSG_WARNING,
1578 "TDLS: Failed to get random data for responder nonce");
1579 wpa_tdls_peer_free(sm, peer);
1580 goto error;
1581 }
1582
1583 #if 0
1584 /* get version info from RSNIE received from Peer */
1585 hdr = (struct rsn_ie_hdr *) kde.rsn_ie;
1586 rsn_ver = WPA_GET_LE16(hdr->version);
1587
1588 /* use min(peer's version, out version) */
1589 if (rsn_ver > RSN_VERSION)
1590 rsn_ver = RSN_VERSION;
1591
1592 hdr = (struct rsn_ie_hdr *) peer->rsnie_p;
1593
1594 hdr->elem_id = WLAN_EID_RSN;
1595 WPA_PUT_LE16(hdr->version, rsn_ver);
1596 pos = (u8 *) (hdr + 1);
1597
1598 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NO_GROUP_ADDRESSED);
1599 pos += RSN_SELECTOR_LEN;
1600 /* Include only the selected cipher in pairwise cipher suite */
1601 WPA_PUT_LE16(pos, 1);
1602 pos += 2;
1603 if (cipher == WPA_CIPHER_CCMP)
1604 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1605 pos += RSN_SELECTOR_LEN;
1606
1607 WPA_PUT_LE16(pos, 1);
1608 pos += 2;
1609 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_TPK_HANDSHAKE);
1610 pos += RSN_SELECTOR_LEN;
1611
1612 rsn_capab = WPA_CAPABILITY_PEERKEY_ENABLED;
1613 rsn_capab |= RSN_NUM_REPLAY_COUNTERS_16 << 2;
1614 WPA_PUT_LE16(pos, rsn_capab);
1615 pos += 2;
1616
1617 hdr->len = (pos - peer->rsnie_p) - 2;
1618 peer->rsnie_p_len = pos - peer->rsnie_p;
1619 #endif
1620
1621 /* temp fix: validation of RSNIE later */
1622 os_memcpy(peer->rsnie_p, peer->rsnie_i, peer->rsnie_i_len);
1623 peer->rsnie_p_len = peer->rsnie_i_len;
1624
1625 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE for TPK handshake",
1626 peer->rsnie_p, peer->rsnie_p_len);
1627
1628 peer->lifetime = lifetime;
1629
1630 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1631
1632 skip_rsn_check:
1633 /* add the peer to the driver as a "setup in progress" peer */
1634 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
1635
1636 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Response / TPK M2");
1637 if (wpa_tdls_send_tpk_m2(sm, src_addr, dtoken, lnkid, peer) < 0) {
1638 wpa_tdls_disable_link(sm, peer->addr);
1639 goto error;
1640 }
1641
1642 return 0;
1643
1644 error:
1645 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_RESPONSE, dtoken,
1646 status);
1647 return -1;
1648 }
1649
1650
1651 static void wpa_tdls_enable_link(struct wpa_sm *sm, struct wpa_tdls_peer *peer)
1652 {
1653 peer->tpk_success = 1;
1654 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1655 if (wpa_tdls_get_privacy(sm)) {
1656 u32 lifetime = peer->lifetime;
1657 /*
1658 * Start the initiator process a bit earlier to avoid race
1659 * condition with the responder sending teardown request.
1660 */
1661 if (lifetime > 3 && peer->initiator)
1662 lifetime -= 3;
1663 eloop_register_timeout(lifetime, 0, wpa_tdls_tpk_timeout,
1664 sm, peer);
1665 #ifdef CONFIG_TDLS_TESTING
1666 if (tdls_testing & TDLS_TESTING_NO_TPK_EXPIRATION) {
1667 wpa_printf(MSG_DEBUG, "TDLS: Testing - disable TPK "
1668 "expiration");
1669 eloop_cancel_timeout(wpa_tdls_tpk_timeout, sm, peer);
1670 }
1671 #endif /* CONFIG_TDLS_TESTING */
1672 }
1673
1674 /* add supported rates and capabilities to the TDLS peer */
1675 wpa_sm_tdls_peer_addset(sm, peer->addr, 0, peer->capability,
1676 peer->supp_rates, peer->supp_rates_len);
1677
1678 wpa_sm_tdls_oper(sm, TDLS_ENABLE_LINK, peer->addr);
1679 }
1680
1681
1682 static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
1683 const u8 *buf, size_t len)
1684 {
1685 struct wpa_tdls_peer *peer;
1686 struct wpa_eapol_ie_parse kde;
1687 struct wpa_ie_data ie;
1688 int cipher;
1689 struct wpa_tdls_ftie *ftie;
1690 struct wpa_tdls_timeoutie *timeoutie;
1691 struct wpa_tdls_lnkid *lnkid;
1692 u32 lifetime;
1693 u8 dtoken;
1694 int ielen;
1695 u16 status;
1696 const u8 *pos;
1697
1698 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Response / TPK M2 "
1699 "(Peer " MACSTR ")", MAC2STR(src_addr));
1700 for (peer = sm->tdls; peer; peer = peer->next) {
1701 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1702 break;
1703 }
1704 if (peer == NULL) {
1705 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1706 "TPK M2: " MACSTR, MAC2STR(src_addr));
1707 return -1;
1708 }
1709 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_REQUEST);
1710
1711 if (len < 3 + 2 + 1)
1712 return -1;
1713 pos = buf;
1714 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1715 status = WPA_GET_LE16(pos);
1716 pos += 2 /* status code */;
1717
1718 if (status != WLAN_STATUS_SUCCESS) {
1719 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M2: %u",
1720 status);
1721 if (sm->tdls_external_setup)
1722 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1723 return -1;
1724 }
1725
1726 status = WLAN_STATUS_UNSPECIFIED_FAILURE;
1727
1728 /* TODO: need to verify dialog token matches here or in kernel */
1729 dtoken = *pos++; /* dialog token */
1730
1731 wpa_printf(MSG_DEBUG, "TDLS: Dialog Token in TPK M2 %d", dtoken);
1732
1733 if (len < 3 + 2 + 1 + 2)
1734 return -1;
1735
1736 /* capability information */
1737 peer->capability = WPA_GET_LE16(pos);
1738 pos += 2;
1739
1740 ielen = len - (pos - buf); /* start of IE in buf */
1741 if (wpa_supplicant_parse_ies(pos, ielen, &kde) < 0) {
1742 wpa_printf(MSG_INFO, "TDLS: Failed to parse IEs in TPK M2");
1743 goto error;
1744 }
1745
1746 #ifdef CONFIG_TDLS_TESTING
1747 if (tdls_testing & TDLS_TESTING_DECLINE_RESP) {
1748 wpa_printf(MSG_DEBUG, "TDLS: Testing - decline response");
1749 status = WLAN_STATUS_REQUEST_DECLINED;
1750 goto error;
1751 }
1752 #endif /* CONFIG_TDLS_TESTING */
1753
1754 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1755 wpa_printf(MSG_INFO, "TDLS: No valid Link Identifier IE in "
1756 "TPK M2");
1757 goto error;
1758 }
1759 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M2",
1760 kde.lnkid, kde.lnkid_len);
1761 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1762
1763 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1764 wpa_printf(MSG_INFO, "TDLS: TPK M2 from different BSS");
1765 status = WLAN_STATUS_NOT_IN_SAME_BSS;
1766 goto error;
1767 }
1768
1769 if (copy_supp_rates(&kde, peer) < 0)
1770 goto error;
1771
1772 if (!wpa_tdls_get_privacy(sm)) {
1773 peer->rsnie_p_len = 0;
1774 peer->cipher = WPA_CIPHER_NONE;
1775 goto skip_rsn;
1776 }
1777
1778 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie) ||
1779 kde.rsn_ie == NULL) {
1780 wpa_printf(MSG_INFO, "TDLS: No FTIE or RSN IE in TPK M2");
1781 status = WLAN_STATUS_INVALID_PARAMETERS;
1782 goto error;
1783 }
1784 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1785 kde.rsn_ie, kde.rsn_ie_len);
1786
1787 /*
1788 * FIX: bitwise comparison of RSN IE is not the correct way of
1789 * validation this. It can be different, but certain fields must
1790 * match. Since we list only a single pairwise cipher in TPK M1, the
1791 * memcmp is likely to work in most cases, though.
1792 */
1793 if (kde.rsn_ie_len != peer->rsnie_i_len ||
1794 os_memcmp(peer->rsnie_i, kde.rsn_ie, peer->rsnie_i_len) != 0) {
1795 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M2 does "
1796 "not match with RSN IE used in TPK M1");
1797 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Sent in TPK M1",
1798 peer->rsnie_i, peer->rsnie_i_len);
1799 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M2",
1800 kde.rsn_ie, kde.rsn_ie_len);
1801 status = WLAN_STATUS_INVALID_RSNIE;
1802 goto error;
1803 }
1804
1805 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
1806 wpa_printf(MSG_INFO, "TDLS: Failed to parse RSN IE in TPK M2");
1807 status = WLAN_STATUS_INVALID_RSNIE;
1808 goto error;
1809 }
1810
1811 cipher = ie.pairwise_cipher;
1812 if (cipher == WPA_CIPHER_CCMP) {
1813 wpa_printf(MSG_DEBUG, "TDLS: Using CCMP for direct link");
1814 cipher = WPA_CIPHER_CCMP;
1815 } else {
1816 wpa_printf(MSG_INFO, "TDLS: No acceptable cipher in TPK M2");
1817 status = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
1818 goto error;
1819 }
1820
1821 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M2",
1822 kde.ftie, sizeof(*ftie));
1823 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1824
1825 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
1826 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
1827 "not match with FTIE SNonce used in TPK M1");
1828 /* Silently discard the frame */
1829 return -1;
1830 }
1831
1832 /* Responder Nonce and RSN IE */
1833 os_memcpy(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN);
1834 os_memcpy(peer->rsnie_p, kde.rsn_ie, kde.rsn_ie_len);
1835 peer->rsnie_p_len = kde.rsn_ie_len;
1836 peer->cipher = cipher;
1837
1838 /* Lifetime */
1839 if (kde.key_lifetime == NULL) {
1840 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M2");
1841 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1842 goto error;
1843 }
1844 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1845 lifetime = WPA_GET_LE32(timeoutie->value);
1846 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M2",
1847 lifetime);
1848 if (lifetime != peer->lifetime) {
1849 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
1850 "TPK M2 (expected %u)", lifetime, peer->lifetime);
1851 status = WLAN_STATUS_UNACCEPTABLE_LIFETIME;
1852 goto error;
1853 }
1854
1855 wpa_tdls_generate_tpk(peer, sm->own_addr, sm->bssid);
1856
1857 /* Process MIC check to see if TPK M2 is right */
1858 if (wpa_supplicant_verify_tdls_mic(2, peer, (u8 *) lnkid,
1859 (u8 *) timeoutie, ftie) < 0) {
1860 /* Discard the frame */
1861 wpa_tdls_del_key(sm, peer);
1862 wpa_tdls_peer_free(sm, peer);
1863 if (sm->tdls_external_setup)
1864 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1865 return -1;
1866 }
1867
1868 wpa_tdls_set_key(sm, peer);
1869
1870 skip_rsn:
1871 peer->dtoken = dtoken;
1872
1873 wpa_printf(MSG_DEBUG, "TDLS: Sending TDLS Setup Confirm / "
1874 "TPK Handshake Message 3");
1875 wpa_tdls_send_tpk_m3(sm, src_addr, dtoken, lnkid, peer);
1876
1877 wpa_tdls_enable_link(sm, peer);
1878
1879 return 0;
1880
1881 error:
1882 wpa_tdls_send_error(sm, src_addr, WLAN_TDLS_SETUP_CONFIRM, dtoken,
1883 status);
1884 if (sm->tdls_external_setup)
1885 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1886 return -1;
1887 }
1888
1889
1890 static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
1891 const u8 *buf, size_t len)
1892 {
1893 struct wpa_tdls_peer *peer;
1894 struct wpa_eapol_ie_parse kde;
1895 struct wpa_tdls_ftie *ftie;
1896 struct wpa_tdls_timeoutie *timeoutie;
1897 struct wpa_tdls_lnkid *lnkid;
1898 int ielen;
1899 u16 status;
1900 const u8 *pos;
1901 u32 lifetime;
1902
1903 wpa_printf(MSG_DEBUG, "TDLS: Received TDLS Setup Confirm / TPK M3 "
1904 "(Peer " MACSTR ")", MAC2STR(src_addr));
1905 for (peer = sm->tdls; peer; peer = peer->next) {
1906 if (os_memcmp(peer->addr, src_addr, ETH_ALEN) == 0)
1907 break;
1908 }
1909 if (peer == NULL) {
1910 wpa_printf(MSG_INFO, "TDLS: No matching peer found for "
1911 "TPK M3: " MACSTR, MAC2STR(src_addr));
1912 return -1;
1913 }
1914 wpa_tdls_tpk_retry_timeout_cancel(sm, peer, WLAN_TDLS_SETUP_RESPONSE);
1915
1916 if (len < 3 + 3)
1917 return -1;
1918 pos = buf;
1919 pos += 1 /* pkt_type */ + 1 /* Category */ + 1 /* Action */;
1920
1921 status = WPA_GET_LE16(pos);
1922
1923 if (status != 0) {
1924 wpa_printf(MSG_INFO, "TDLS: Status code in TPK M3: %u",
1925 status);
1926 if (sm->tdls_external_setup)
1927 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
1928 return -1;
1929 }
1930 pos += 2 /* status code */ + 1 /* dialog token */;
1931
1932 ielen = len - (pos - buf); /* start of IE in buf */
1933 if (wpa_supplicant_parse_ies((const u8 *) pos, ielen, &kde) < 0) {
1934 wpa_printf(MSG_INFO, "TDLS: Failed to parse KDEs in TPK M3");
1935 return -1;
1936 }
1937
1938 if (kde.lnkid == NULL || kde.lnkid_len < 3 * ETH_ALEN) {
1939 wpa_printf(MSG_INFO, "TDLS: No Link Identifier IE in TPK M3");
1940 return -1;
1941 }
1942 wpa_hexdump(MSG_DEBUG, "TDLS: Link ID Received from TPK M3",
1943 (u8 *) kde.lnkid, kde.lnkid_len);
1944 lnkid = (struct wpa_tdls_lnkid *) kde.lnkid;
1945
1946 if (os_memcmp(sm->bssid, lnkid->bssid, ETH_ALEN) != 0) {
1947 wpa_printf(MSG_INFO, "TDLS: TPK M3 from diff BSS");
1948 return -1;
1949 }
1950
1951 if (!wpa_tdls_get_privacy(sm))
1952 goto skip_rsn;
1953
1954 if (kde.ftie == NULL || kde.ftie_len < sizeof(*ftie)) {
1955 wpa_printf(MSG_INFO, "TDLS: No FTIE in TPK M3");
1956 return -1;
1957 }
1958 wpa_hexdump(MSG_DEBUG, "TDLS: FTIE Received from TPK M3",
1959 kde.ftie, sizeof(*ftie));
1960 ftie = (struct wpa_tdls_ftie *) kde.ftie;
1961
1962 if (kde.rsn_ie == NULL) {
1963 wpa_printf(MSG_INFO, "TDLS: No RSN IE in TPK M3");
1964 return -1;
1965 }
1966 wpa_hexdump(MSG_DEBUG, "TDLS: RSN IE Received from TPK M3",
1967 kde.rsn_ie, kde.rsn_ie_len);
1968 if (kde.rsn_ie_len != peer->rsnie_p_len ||
1969 os_memcmp(kde.rsn_ie, peer->rsnie_p, peer->rsnie_p_len) != 0) {
1970 wpa_printf(MSG_INFO, "TDLS: RSN IE in TPK M3 does not match "
1971 "with the one sent in TPK M2");
1972 return -1;
1973 }
1974
1975 if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
1976 wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
1977 "not match with FTIE ANonce used in TPK M2");
1978 return -1;
1979 }
1980
1981 if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
1982 wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
1983 "match with FTIE SNonce used in TPK M1");
1984 return -1;
1985 }
1986
1987 if (kde.key_lifetime == NULL) {
1988 wpa_printf(MSG_INFO, "TDLS: No Key Lifetime IE in TPK M3");
1989 return -1;
1990 }
1991 timeoutie = (struct wpa_tdls_timeoutie *) kde.key_lifetime;
1992 wpa_hexdump(MSG_DEBUG, "TDLS: Timeout IE Received from TPK M3",
1993 (u8 *) timeoutie, sizeof(*timeoutie));
1994 lifetime = WPA_GET_LE32(timeoutie->value);
1995 wpa_printf(MSG_DEBUG, "TDLS: TPK lifetime %u seconds in TPK M3",
1996 lifetime);
1997 if (lifetime != peer->lifetime) {
1998 wpa_printf(MSG_INFO, "TDLS: Unexpected TPK lifetime %u in "
1999 "TPK M3 (expected %u)", lifetime, peer->lifetime);
2000 if (sm->tdls_external_setup)
2001 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, src_addr);
2002 return -1;
2003 }
2004
2005 if (wpa_supplicant_verify_tdls_mic(3, peer, (u8 *) lnkid,
2006 (u8 *) timeoutie, ftie) < 0) {
2007 wpa_tdls_del_key(sm, peer);
2008 wpa_tdls_peer_free(sm, peer);
2009 return -1;
2010 }
2011
2012 if (wpa_tdls_set_key(sm, peer) < 0)
2013 return -1;
2014
2015 skip_rsn:
2016 wpa_tdls_enable_link(sm, peer);
2017
2018 return 0;
2019 }
2020
2021
2022 static u8 * wpa_add_tdls_timeoutie(u8 *pos, u8 *ie, size_t ie_len, u32 tsecs)
2023 {
2024 struct wpa_tdls_timeoutie *lifetime = (struct wpa_tdls_timeoutie *) ie;
2025
2026 os_memset(lifetime, 0, ie_len);
2027 lifetime->ie_type = WLAN_EID_TIMEOUT_INTERVAL;
2028 lifetime->ie_len = sizeof(struct wpa_tdls_timeoutie) - 2;
2029 lifetime->interval_type = WLAN_TIMEOUT_KEY_LIFETIME;
2030 WPA_PUT_LE32(lifetime->value, tsecs);
2031 os_memcpy(pos, ie, ie_len);
2032 return pos + ie_len;
2033 }
2034
2035
2036 /**
2037 * wpa_tdls_start - Initiate TDLS handshake (send TPK Handshake Message 1)
2038 * @sm: Pointer to WPA state machine data from wpa_sm_init()
2039 * @peer: MAC address of the peer STA
2040 * Returns: 0 on success, or -1 on failure
2041 *
2042 * Send TPK Handshake Message 1 info to driver to start TDLS
2043 * handshake with the peer.
2044 */
2045 int wpa_tdls_start(struct wpa_sm *sm, const u8 *addr)
2046 {
2047 struct wpa_tdls_peer *peer;
2048 int tdls_prohibited = sm->tdls_prohibited;
2049
2050 if (sm->tdls_disabled || !sm->tdls_supported)
2051 return -1;
2052
2053 #ifdef CONFIG_TDLS_TESTING
2054 if ((tdls_testing & TDLS_TESTING_IGNORE_AP_PROHIBIT) &&
2055 tdls_prohibited) {
2056 wpa_printf(MSG_DEBUG, "TDLS: Testing - ignore AP prohibition "
2057 "on TDLS");
2058 tdls_prohibited = 0;
2059 }
2060 #endif /* CONFIG_TDLS_TESTING */
2061
2062 if (tdls_prohibited) {
2063 wpa_printf(MSG_DEBUG, "TDLS: TDLS is prohibited in this BSS - "
2064 "reject request to start setup");
2065 return -1;
2066 }
2067
2068 /* Find existing entry and if found, use that instead of adding
2069 * a new one */
2070 for (peer = sm->tdls; peer; peer = peer->next) {
2071 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2072 break;
2073 }
2074
2075 if (peer == NULL) {
2076 peer = wpa_tdls_add_peer(sm, addr);
2077 if (peer == NULL)
2078 return -1;
2079 }
2080
2081 peer->initiator = 1;
2082
2083 /* add the peer to the driver as a "setup in progress" peer */
2084 wpa_sm_tdls_peer_addset(sm, peer->addr, 1, 0, NULL, 0);
2085
2086 if (wpa_tdls_send_tpk_m1(sm, peer) < 0) {
2087 wpa_tdls_disable_link(sm, peer->addr);
2088 return -1;
2089 }
2090
2091 return 0;
2092 }
2093
2094
2095 int wpa_tdls_reneg(struct wpa_sm *sm, const u8 *addr)
2096 {
2097 struct wpa_tdls_peer *peer;
2098
2099 if (sm->tdls_disabled || !sm->tdls_supported)
2100 return -1;
2101
2102 for (peer = sm->tdls; peer; peer = peer->next) {
2103 if (os_memcmp(peer->addr, addr, ETH_ALEN) == 0)
2104 break;
2105 }
2106
2107 if (peer == NULL || !peer->tpk_success)
2108 return -1;
2109
2110 if (sm->tdls_external_setup) {
2111 /*
2112 * Disable previous link to allow renegotiation to be completed
2113 * on AP path.
2114 */
2115 wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2116 }
2117
2118 return wpa_tdls_start(sm, addr);
2119 }
2120
2121
2122 /**
2123 * wpa_supplicant_rx_tdls - Receive TDLS data frame
2124 *
2125 * This function is called to receive TDLS (ethertype = 0x890d) data frames.
2126 */
2127 static void wpa_supplicant_rx_tdls(void *ctx, const u8 *src_addr,
2128 const u8 *buf, size_t len)
2129 {
2130 struct wpa_sm *sm = ctx;
2131 struct wpa_tdls_frame *tf;
2132
2133 wpa_hexdump(MSG_DEBUG, "TDLS: Received Data frame encapsulation",
2134 buf, len);
2135
2136 if (sm->tdls_disabled || !sm->tdls_supported) {
2137 wpa_printf(MSG_DEBUG, "TDLS: Discard message - TDLS disabled "
2138 "or unsupported by driver");
2139 return;
2140 }
2141
2142 if (os_memcmp(src_addr, sm->own_addr, ETH_ALEN) == 0) {
2143 wpa_printf(MSG_DEBUG, "TDLS: Discard copy of own message");
2144 return;
2145 }
2146
2147 if (len < sizeof(*tf)) {
2148 wpa_printf(MSG_INFO, "TDLS: Drop too short frame");
2149 return;
2150 }
2151
2152 /* Check to make sure its a valid encapsulated TDLS frame */
2153 tf = (struct wpa_tdls_frame *) buf;
2154 if (tf->payloadtype != 2 /* TDLS_RFTYPE */ ||
2155 tf->category != WLAN_ACTION_TDLS) {
2156 wpa_printf(MSG_INFO, "TDLS: Invalid frame - payloadtype=%u "
2157 "category=%u action=%u",
2158 tf->payloadtype, tf->category, tf->action);
2159 return;
2160 }
2161
2162 switch (tf->action) {
2163 case WLAN_TDLS_SETUP_REQUEST:
2164 wpa_tdls_process_tpk_m1(sm, src_addr, buf, len);
2165 break;
2166 case WLAN_TDLS_SETUP_RESPONSE:
2167 wpa_tdls_process_tpk_m2(sm, src_addr, buf, len);
2168 break;
2169 case WLAN_TDLS_SETUP_CONFIRM:
2170 wpa_tdls_process_tpk_m3(sm, src_addr, buf, len);
2171 break;
2172 case WLAN_TDLS_TEARDOWN:
2173 wpa_tdls_recv_teardown(sm, src_addr, buf, len);
2174 break;
2175 case WLAN_TDLS_DISCOVERY_REQUEST:
2176 wpa_tdls_process_discovery_request(sm, src_addr, buf, len);
2177 break;
2178 default:
2179 /* Kernel code will process remaining frames */
2180 wpa_printf(MSG_DEBUG, "TDLS: Ignore TDLS frame action code %u",
2181 tf->action);
2182 break;
2183 }
2184 }
2185
2186
2187 /**
2188 * wpa_tdls_init - Initialize driver interface parameters for TDLS
2189 * @wpa_s: Pointer to wpa_supplicant data
2190 * Returns: 0 on success, -1 on failure
2191 *
2192 * This function is called to initialize driver interface parameters for TDLS.
2193 * wpa_drv_init() must have been called before this function to initialize the
2194 * driver interface.
2195 */
2196 int wpa_tdls_init(struct wpa_sm *sm)
2197 {
2198 if (sm == NULL)
2199 return -1;
2200
2201 sm->l2_tdls = l2_packet_init(sm->bridge_ifname ? sm->bridge_ifname :
2202 sm->ifname,
2203 sm->own_addr,
2204 ETH_P_80211_ENCAP, wpa_supplicant_rx_tdls,
2205 sm, 0);
2206 if (sm->l2_tdls == NULL) {
2207 wpa_printf(MSG_ERROR, "TDLS: Failed to open l2_packet "
2208 "connection");
2209 return -1;
2210 }
2211
2212 /*
2213 * Drivers that support TDLS but don't implement the get_capa callback
2214 * are assumed to perform everything internally
2215 */
2216 if (wpa_sm_tdls_get_capa(sm, &sm->tdls_supported,
2217 &sm->tdls_external_setup) < 0) {
2218 sm->tdls_supported = 1;
2219 sm->tdls_external_setup = 0;
2220 }
2221
2222 wpa_printf(MSG_DEBUG, "TDLS: TDLS operation%s supported by "
2223 "driver", sm->tdls_supported ? "" : " not");
2224 wpa_printf(MSG_DEBUG, "TDLS: Driver uses %s link setup",
2225 sm->tdls_external_setup ? "external" : "internal");
2226
2227 return 0;
2228 }
2229
2230
2231 static void wpa_tdls_remove_peers(struct wpa_sm *sm)
2232 {
2233 struct wpa_tdls_peer *peer, *tmp;
2234
2235 peer = sm->tdls;
2236 sm->tdls = NULL;
2237
2238 while (peer) {
2239 int res;
2240 tmp = peer->next;
2241 res = wpa_sm_tdls_oper(sm, TDLS_DISABLE_LINK, peer->addr);
2242 wpa_printf(MSG_DEBUG, "TDLS: Remove peer " MACSTR " (res=%d)",
2243 MAC2STR(peer->addr), res);
2244 wpa_tdls_peer_free(sm, peer);
2245 os_free(peer);
2246 peer = tmp;
2247 }
2248 }
2249
2250
2251 /**
2252 * wpa_tdls_deinit - Deinitialize driver interface parameters for TDLS
2253 *
2254 * This function is called to recover driver interface parameters for TDLS
2255 * and frees resources allocated for it.
2256 */
2257 void wpa_tdls_deinit(struct wpa_sm *sm)
2258 {
2259 if (sm == NULL)
2260 return;
2261
2262 if (sm->l2_tdls)
2263 l2_packet_deinit(sm->l2_tdls);
2264 sm->l2_tdls = NULL;
2265
2266 wpa_tdls_remove_peers(sm);
2267 }
2268
2269
2270 void wpa_tdls_assoc(struct wpa_sm *sm)
2271 {
2272 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on association");
2273 wpa_tdls_remove_peers(sm);
2274 }
2275
2276
2277 void wpa_tdls_disassoc(struct wpa_sm *sm)
2278 {
2279 wpa_printf(MSG_DEBUG, "TDLS: Remove peers on disassociation");
2280 wpa_tdls_remove_peers(sm);
2281 }
2282
2283
2284 static int wpa_tdls_prohibited(const u8 *ies, size_t len)
2285 {
2286 struct wpa_eapol_ie_parse elems;
2287
2288 if (ies == NULL)
2289 return 0;
2290
2291 if (wpa_supplicant_parse_ies(ies, len, &elems) < 0)
2292 return 0;
2293
2294 if (elems.ext_capab == NULL || elems.ext_capab_len < 2 + 5)
2295 return 0;
2296
2297 /* bit 38 - TDLS Prohibited */
2298 return !!(elems.ext_capab[2 + 4] & 0x40);
2299 }
2300
2301
2302 void wpa_tdls_ap_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2303 {
2304 sm->tdls_prohibited = wpa_tdls_prohibited(ies, len);
2305 wpa_printf(MSG_DEBUG, "TDLS: TDLS is %s in the target BSS",
2306 sm->tdls_prohibited ? "prohibited" : "allowed");
2307 }
2308
2309
2310 void wpa_tdls_assoc_resp_ies(struct wpa_sm *sm, const u8 *ies, size_t len)
2311 {
2312 if (!sm->tdls_prohibited && wpa_tdls_prohibited(ies, len)) {
2313 wpa_printf(MSG_DEBUG, "TDLS: TDLS prohibited based on "
2314 "(Re)Association Response IEs");
2315 sm->tdls_prohibited = 1;
2316 }
2317 }
2318
2319
2320 void wpa_tdls_enable(struct wpa_sm *sm, int enabled)
2321 {
2322 wpa_printf(MSG_DEBUG, "TDLS: %s", enabled ? "enabled" : "disabled");
2323 sm->tdls_disabled = !enabled;
2324 }
2325
2326
2327 int wpa_tdls_is_external_setup(struct wpa_sm *sm)
2328 {
2329 return sm->tdls_external_setup;
2330 }
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